单项选择题

The accident ______ downtown yesterday resulted from the driver's carelessness.

A．happening
B．happened
C．which had happened
D．which happened
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单项选择题
When our university laboratory bought this microscope we were given a one year's ______.
A．reservation
B．security
C．proof
D．guarantee
单项选择题
A．soB．muchC．ratherD．too
A．so
B．much
C．rather
D．too
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